1. The National Archives, 1957. PREM/11/2351. Attlee Report on The Burden on Ministers.
2. The National Archives, 1979. CAB/21/1638. Functions of the Prime Minister and his staff, 1948.
3. The National Archives, 1997a. PREM 49/10. Forward Look of Cabinet and Cabinet Committee Business, May–August 1997.
4. The National Archives, 1997b. PREM 49/12. Memo from Alex Allan, enclosing note from Cabinet Secretary Sir Robin Butler, on the appointment of the Successor to Sir Robin Butler as Cabinet Secretary.
5. Leighton Andrews, 2018. 17 December.